覆盖来自子主题的父主题的包含文件

我试图从子主题重写父主题的包含文件。代码如下：

parentTheme/functions.php

<?php



define ( "_CRYOUT_THEME_NAME", "fluida" );
define ( "_CRYOUT_THEME_VERSION", "1.2.6" );

require_once( get_template_directory() . "/admin/main.php" );
require_once( get_template_directory() . "/includes/setup.php" );
require_once( get_template_directory() . "/includes/styles.php" );
require_once( get_template_directory() . "/includes/loop.php" );
require_once( get_template_directory() . "/includes/comments.php" );
require_once( get_template_directory() . "/includes/core.php" );
require_once( get_template_directory() . "/includes/hooks.php" );
require_once( get_template_directory() . "/includes/meta.php" );
require_once( get_template_directory() . "/includes/landing-page.php" );

childTheme/functions.php

<?php

add_action( \'wp_enqueue_scripts\', \'my_theme_enqueue_styles\' );
function my_theme_enqueue_styles() {
    wp_enqueue_style( \'parent-style\', get_template_directory_uri() . \'/style.css\' );
}

?>

我想覆盖/includes/core.php 文件我有一个childTheme/includes/core.php 文件
但当我更改它时，我的网站上没有任何更改
我已尝试将此代码添加到childTheme/functions.php :

require_once( get_stylesheet_directory() . "/includes/core.php");

但它会在我的网站上呈现一个空白页面。

编辑：

我尝试过：

<?php
/**
* Enqueues child theme stylesheet, loading first the parent theme stylesheet.
*/
require_once( get_stylesheet_directory() . "/includes/core.php" );        // Core functions

function themify_custom_enqueue_child_theme_styles() {
    wp_enqueue_style( \'parent-theme-css\', get_template_directory_uri() . \'/style.css\' );
}
add_action( \'wp_enqueue_scripts\', \'themify_custom_enqueue_child_theme_styles\', 11 );

但我有一个错误：

Cannot redeclare xxx_function_name 
(previously declared in /var/www/html/mywebsite/wp-content/themes/***childTheme***/includes/core.php:340)
in /var/www/html/tpevegetarisme/wp-content/themes/***parentTheme***/includes/core.php on line 340

那么，如何防止父主题重新声明函数呢

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